Carney J.S.,American Ecotech |
Strain J.,American Ecotech |
Phelps M.,American Ecotech
Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA | Year: 2014
Initial results of an ongoing study with nephelometers in roadside and industrial ambient monitoring environments are presented. A three wavelength nephelometer has been deployed by American Ecotech at the EPA roadside monitoring station located on the north side of Interstate 40 between Exit 284 (Airport Blvd) and Exit 283B (I-540 North), along the west bound lanes in Research Triangle Park, NC. The station houses both gaseous and particulate instrumentation, including NOx, trace level CO, ozone, PM2.5, aethalometer, and ultrafine particulate monitor. Scattering values were highest in the blue wavelength (450 nm) band, next was the green wavelength (525 nm), and the red wavelength (635 nm). The blue wavelength scattering values typically represent the presence of very fine particulate (< 1 μm) related to auto emissions. This is an abstract of a paper presented at the AWMA's 107th Annual Conference & Exhibition (Long Beach, CA 6/24-27/2014).
Kizer T.,American Ecotech
Power Engineering (Barrington, Illinois) | Year: 2010
A brief overview of different verification techniques that are unique to common forms of air monitoring are discussed. A proper gas calibration cylinder should have NIST traceability through the NTRM (NIST traceable reference material) program. When setting up a system, an important consideration when using calibration cylinders is the lead time required. Linearity is checked by testing multiple calibration points along the range of the analyzer. Using a calibration dilution system, a single bottle can be used to achieve multiple points by combining a higher-concentration cylinder with a zero-air, thereby diluting the concentration to the appropriate level. After an analyzer has been calibrated, daily spans and zero checks are required to ensure there is no instrument drift. Analyzers can be equipped with internal calibration units, either permeations tubes or internal generation. Internal ozone generation accomplished in the same way that ozone generating transfer standards produce ozone, through the use of ozone generating UV lamps.
Carney J.,American Ecotech
Pollution Engineering | Year: 2010
John Carney, environmental instrumentation specialist, discusses the questions that need to be considered for developing a framework for effective fence-line monitoring. Facilities have installed a continuous emission monitoring system (CEMS) that monitors dust or particulate emissions. The number of potential monitoring locations along the facility's perimeter are determined such as if there is a residential neighborhood along just one side of the property, then the focus of any monitoring will be likely be along the perimeter. The best places to locate the monitoring sites are determined that includes paying attention to locations of obstructions such as trees, buildings or other structures, which could impact the quality of the data. Another consideration is the location of utilities and general access to a site such as in some cases a facility's layout may be such that is it impossible to provide grid power to a site so the use of battery or solar powered operated samplers or monitoring equipment may be required.
Evans R.D.,American Ecotech
Air and Waste Management Association - Symposium on Air Quality Measurement Methods and Technology 2010 | Year: 2010
A proposed new Secondary PM NAAQS based on light extinction (bext) measurement appears likely to be released for comment in February of 2011. The new standard will be based on surrogate bext values calculated using data from existing FEM PM 2.5 networks and adjusted for RH and chemical speciation data, based on the algorithm currently being used in the IMPROVE network. The exact level of the NAAQS is still to be decided upon but will likely be either 65 Mm-1, 110 Mm-1 or 190 Mm-1 with the standard being based on either a one hour average or a three to four hour averaging period.
Wejas B.,American Ecotech
EM: Air and Waste Management Association's Magazine for Environmental Managers | Year: 2010
The establishment of US National Ambient Air Quality Standards (NAAQS) has identified criteria pollutants that require monitoring due to their adverse health effects and other indirect. It is estimated that in the United States, more than 35 million people have within 300 feet of a major transportation infrastructure and according to the US Department of Transportations Federal High way Administration, there are approximately 250 million vehicles on the road. The network design includes careful planning on the number and type of analyzers, as well as site locations. VOC compounds are typically sampled using metal canisters with either passive or active collection techniques followed by laboratory chromatography analysis. The use of a continuous gas chromatograph at a near-road monitoring station offers several advantages over the existing canister sampling method. The necessary decision making involved in the establishment of a new near-road monitoring station/network can be complicated, especially in difficult economic times.
Thompson M.,American Ecotech
Pollution Engineering | Year: 2010
New lead standards are going to require new sampling methods in the environmental industry. Infants and young children were found to be especially sensitive to low levels of lead, which was linked to behavioral problems, learning deficits and lowered IQ. The federal government, including the EPA, took steps to regulate the propagation of lead by phasing out leaded gasoline, and creating standards for lead in paint, drinking water, and solid waste. This primary standard will be used to set limits to protect public health from the adverse effects of airborne lead, while the secondary standard will set limits to protect public welfare, such as damage to crops, animals and buildings. Current technology is not capable of real-time monitoring for lead, so traditional high-volume samplers must be used. Careful planning and research will produce valid, defensible results, while improvements in technology have increased the effectiveness and accuracy of modern high-volume samplers.
Agency: Department of Energy | Branch: | Program: SBIR | Phase: Phase I | Award Amount: 224.73K | Year: 2016
This project will develop a novel, multi-wavelength integrating nephelometer, for use on small aerial platforms; such as UAS, tethered balloons, kites and other space-constrained applications. The main goal is to reduce the size of a typical research grade integrating nephelometer, maintaining its detection limit in the miniaturized device through technology innovation. The proposed nephelometer will use an integrated sphere (or cavity) for homogeneous illumination of the sample volume, combining a very low truncation angle with the ability to multiply the light intensity in the sample volume using the multiple reflection paths of the sphere. American Ecotech plan to implement an approach where the light sources are mounted on the equator of the sphere and test newer materials improving the reflectivity inside the sphere. This way, enough sensitivity gain will be accomplished to further miniaturize the nephelometer making it ideal for UAS and other space-constrained applications. This design approach allows for an easy implementation of multiple wavelength operation to measure scattering Ångström exponents in the same aerosol sample. During Phase 1, a feasibility study will be conducted, utilizing existing LED technology to perform multiple characterization tests on the equator geometry design, which will identify critical design elements and parameters for the instrument. Furthermore, provisions to reduce sampling time, and increase the measurement speed in the miniaturized instrument will be tested as this will further enhance the capabilities for UAS applications and other time critical measurements. Initially these Instruments will benefit greatly the research community as they enable research with better spatial and time resolution as obtainable by satellite measurements, but they will enable many other applications, where fast, accurate, reliable, independent measurements are needed from event monitoring like wildfires to regulatory or exploratory measurements for Plume distribution, Plant emissions, Process surveillance and control etc. Novel compact and sensitive instruments measuring light scattering from microscopic airborne particles (i.e., aerosols) are needed for deployment on small aerial platforms to characterize aerosol influence on air quality, climate change, and visibility degradation. The project aims to develop such instruments based on transformative technological innovation and novel materials.